Waste Heat Rotary Drum Dryer for Wood Chips (170)

Design requirementsMaterial: wood chips max 50x50x50mm, with wood dust and sludge.Capacity: 6t/h, 50% moisture dried to 15%.Moisture dried 2330kg/hour.Heat resource: flue gas from boiler, 100000m3/h at 170ºC.Density of material: 380kg/m3.

Energy calculation

Heat energy of flue gas at 170ºC: 3,572,600kcal/hHeat energy for evaporation of water 2330kg: 1,631,000kcal/h.Energy of 3120kg materials absorbed, temperature of material rising calculated from 0 to 70ºC: 98300kcal/h.Dried material energy: 38500kcal/h.Exhaust flue gas temperature: 85ºC.Efficiency of energy use: 50%.Heat loss of drum (when insulated): 6%.Required heat energy for drying: 3,616,600kcal/h. Moisture in exhaust flue gas: 24.76g/Nm3

Processing of drum dryer

Flue gas and materials go into drum together.Materials are fed and discharged continuously with feeding conveyor and discharge screw.Materials come to the feeding seal.The drum is supported with frames, rotating rotors and bearing, and rotates continuously.There are material guiding plates inside the drum, and in the middle of drum there is material distributing plate which turns the material over and changes the direction of flue gas.Waste gas pass through the cyclone, I.D. fan and pipeline, and go into the flue gas system and dust removing system of boiler.The dust collected by cyclone is discharged by screw conveyor.